Dexter's executive producer Sara Colleton has confirmed that Deb will find out about her brother's secret life at some point in the show.

Colleton did not say whether Deb (Jennifer Carpenter) would discover the truth about Dexter (Michael C Hall) in the upcoming sixth season but suggested that she will eventually learn about his life as a serial killer.

"I know the question on everyone's mind is, 'What's going to happen if, when, how she finds out about the Dark Passenger side of her brother?'" Colleton told TV Line.

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"When and how that's going to be handled has not been quite decided, but it will happen."

"Dexter and Deb have one of the great brother-sister relationships in any television series," she said. "Things will happen in each of their lives that the other will have to adjust to, but it's in how they do so that matters."

Colleton also suggested that Deb is evolving on the show, saying: "Over the seasons, she's gotten a much greater sense of self and more confidence, especially when it comes to what she deserves in life. Deb comes into real strength as a grown woman this season, both in her personal and professional life."